Bit.



F. A. PICA.

BIT.

APPLICATION FILED JULY 27, 1911.

Patented Now-14, 1911.

WITNESSES: 1 M

ATTORNEYS UNITED STATES PATENT OFFICE.

FRANCESCO ANTONIO PICA, 0F NEWARK, NEW JERSEY.

To all whom it may concern:

Be it known that I, FRANCESCO ANTONIO PICA, a citizen of the UnitedStates, residing at Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in Bits; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompany ing drawings, and to figures of reference markedthereon, which form a part of this specification.

This invention relates to a bit or auger which is adapted to bore holesof different diameters andto also bore a hole with a countersunkportion. The bit is provided with a main boring portion of any typewhich drills or bores a hole and then acts to hold the bit so that theadjustable cutter cuts or bores a larger hole concentric with thepreviously bored hole. The adjustable cutter is mounted above the mainboring portion and is actuated by an adjusting mechanism so as toproject from the bitstock any desired distance. A holding means may beprovided for securing the adjustable cutter in any of its differentpositions, the cutter when in its normal position being entirely withinthe bit-stock so as to not interfere with the main boring portion. Theadjustable cutter is provided with a scale for indicating the size ofthe hole it will bore, and is preferably returned to its normal positionby a spring.

The invention is illustrated in the accompanying drawing, in which-Figure 1 is a side view of my improved bit. Fig. 2 is a vertical sectionof the upper portion thereof. Fig. 3 is a section on line 3, 3, in Fig.2. Fig. 4 is a section on line 4, 4, in Fig. 2, and Fig. 5 is a viewsimilar to Fig. 1 but of a modified form of cutter.

The bit consists of a bit-stock 10 which is rovided at its bottom endwith a main bor- 1ng portion 11 which may be of any of the usual typesused in bits and augers, but shown in the illustration as one of thespiral type with a centering or guiding tip 12. At its top the bit isprovided with a finger 13 for its attachment to a brace or other turningmechanism which is not shown. The

bit-stock is slotted as at 14 so as to permit the swinging cutter-plate15 to move within the stock. The cutter is provided with a Specificationof Letters Patent.

Application filed July 27, 1911.

Patented Nov. 14, 1911.

Serial No. 640,785.

cutting edge 16, which, when the cutter is,ir. its normal position, fitswithin the cut-away port-ion 17 of the stock 10. The cutter may beprovided with two cutting edges 18, as i1. Fig. 5, so that the bit canbe used right or left-handed. A screw 19 is arranged in the stock 10 andabuts on the top end 20 of the cutter 15 and acts to force the cutter toswing on its end 21 in the pocket 22 of the stock, when the finger-piece23 of the screw 19 is turned. A set-screw 24 is arranged iI. the stockand can be screwed in to engage the cutter 15 and bind it in its placeso that if the screw 19 retreats the cutter is held iI. place. Thecutter has a nose 25 which has: a scale thereon which indicates at asuitable place, as the edge of the stock, the diameter of the hole thecutter is adjusted to cut. The spring 26 bears on the stock and on thecutter to force the cutter to its normal posi tion wh'ep it is free toswing.

The disposition of the adjustable cutter between the main boring portion11 of the bit and the attaching means or end 13. while it places thecutter in a convenient and. accessible position, also gives it the advantage of being held centered or concentric to a hole 27 bored by the mainboring portion 11. With an ordinary extension bit, when at the beginningof the enlarged boring, has

no bearing in the hole.

Having thus described my invention, when I claim is 1. A bit comprisinga stock having a cutter-plate pivoted at its bottom in the stool: andadapted to swing therein, a spring for normally holding the cutter-platewithin the stock, and a screw in the stock and bearing on thecutter-plate for forcing the cutterplate to project from the stock.

2. A bit comprising a stock with a boring portion at the bottom andhaving a slot above the boring portion, a cutter-plate swinging in theslot, the cutter-plate being in pivotal relation with the stock at thebottom of the cutter-plate, a screw in the stool: and'bearing on thecutter to force the cutter from the stock, a spring bearing on thestool: and on the cutter-plate to force the cutterplate to its normalposition, and a nose on the cutter having a scale thereon.

3. A bit comprising a stock with a boring; portion at the bottom, thestock having a $10;

thereinabove the boring portion, the slot having a pocket in the bottom,a cutter-plate with a nose to enter the pocket and having a cuttin edgeadapted to be projected from 5 the stoe when the cutter-plate is swung,a

spring tending to normally force the cutterplate within the stock, ascrew in the stock and bearing on the cutter-plate to force thecutter-plate from the stock and a set-screw 10 in the stock atright-angles to the swinging movement of the cutter, said set-screwbeing adapted to look the cutter in its adjusted pos tions.

In testimony that I claim the foregoing, I have hereunto set my handthis 25th day of 1.5 July, 1911.

FRANCESCO ANTONIO PICA.

Witnesses:

WM. H. GAMFIELD, WILLIAM DANTON.

Copies of this patent may be obtained for five cents each, by .addressing the Commissioner of Patents. Washington. D. O.

